Hello Kent, and thank you .. so I gather that maybe there's not a simple "That happens when you do so-and-so, so you must have accidentally set that" kind of reason then ... pity, I was hoping just to undo a step and clear it.

I'm in the UK and it is coming up to 1:30am Fri and I am about to head to bed, plus I am not at the right computer now anyway, but I will email you that file in the morning and hopefully you can throw some light on it.

Unless in the meantime someone else has had that same thing happen and can point me toward the explanation and remedy?

Thanks.